Question

对mods的注意事项：请注意，这个问题并不是一个品味问题。我要求提供有关我在Spacemacs＆＃39;中遇到的缩进约定的具体信息。 elisp的默认缩进规则。

为什么这段代码会被格式化程序缩进：

(defun lispy--maybe-safe-delete-region (beg end)
  "Delete the region from BEG to END.
If `lispy-safe-delete' is non-nil, exclude unmatched delimiters."
  (if lispy-safe-delete
      (let ((safe-regions (lispy--find-safe-regions beg end)))
        (dolist (safe-region safe-regions)
          (delete-region (car safe-region) (cdr safe-region)))
        (test))
    (delete-region beg end)
    (test)))

而不是这样：

(defun lispy--maybe-safe-delete-region (beg end)
  "Delete the region from BEG to END.
If `lispy-safe-delete' is non-nil, exclude unmatched delimiters."
  (if lispy-safe-delete
      (let ((safe-regions (lispy--find-safe-regions beg end)))
        (dolist (safe-region safe-regions)
          (delete-region (car safe-region) (cdr safe-region)))
        (test))
      (delete-region beg end)
      (test)))

如您所见，默认格式没有在同一级别缩进if sexp的子级。我不了解它运作的规则，因为let sexp的孩子在同一级别缩进。

Answer 1

因为Emacs Lisp的IF运算符允许一个然后表单和多个 else 表单。为了便于阅读， else 表单与然后表单的缩进方式不同。

ELISP> (if (> 10 20)
           (print 'foo)
         (princ 'bar)
         (princ 'baz)
         nil)
barbaz
nil

lisp的典型缩进约定背后的规则是什么？

1 个答案: